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Nuclear Theory·nucl-th

Thursday·October 12, 2023

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 11 Oct 2023]

    Modes of massive nucleon transfer appearing in quasifission processes for collisions of superheavy nuclei

    S. Amano · Y. Aritomo · M. Ohta

    It is challenging to distinguish between fusion-fission and quasifission experimentally. To determine the characteristics of quasifission processes associated with dominant phenomena in heavy-ion collisions is important for estimating precisely the fusion cross section, which is relevant to the synthesis of new elements. We classified fusion-fission and quasifission processes theoretically in the past for an accurate assessment of the fusion cross section. However, no detailed analysis focused on each process was performed. In this work, we aimed to analyze the dynamical characteristics of quasifission processes in terms of the Langevin equation model. We specify the quasifission processes, and analyze the scission configuration. Finally, we clarify the origin of several modes included in quasifission. The calculation framework is the multidimensional dynamical model of nucleus-nucleus collisions based on the Langevin equations. It is shown that several quasifission modes exist leading to different fragment deformations. The time scale of the quasifission process differs for several different modes. Each scission configuration and total kinetic energy also differ. The different quasifission modes are caused by the neck relaxation controlling the mass drift toward symmetry. This means that it is possible to discuss the time-dependent functional form of the neck parameter for the quasifission process in the framework of the dynamical model based on Langevin equations.

    Comments:
    10 pages, 9 figures. arXiv admin note: text overlap with arXiv:2309.11771, arXiv:2309.15549
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.07210 [pdf]
    PRC(2022)·11 citations
  2. 02

    [Submitted on 11 Oct 2023]

    Numerical Simulation Study of Neutron-Proton Scattering using Phase Function Method

    Shikha Awasthi · Anil Khachi · Lalit Kumar · O.S.K.S. Sastri

    In this article, we propose a numerical approach to solve quantum mechanical scattering problems, using phase function method, by considering neutron-proton interaction as an example. The nonlinear phase equation, obtained from the time-independent Schrodinger equation, is solved using the Runge-Kutta method for obtaining S-wave scattering phase shifts for neutron-proton interaction modeled using Yukawa and Malfliet-Tjon potentials. While scattering phase shifts of S-states using Yukawa match with experimental data for only lower energies of 50 MeV, Malfliet-Tjon potential with repulsive term gives very good accuracy for all available energies up to 350 MeV. Utilizing these S-wave scattering phase shifts, low energy scattering parameters, and total S-wave cross section have been calculated and found to be consistent with experimental results. This simulation methodology can be easily extended to study scattering phenomenon using phase wave analysis approach in the realms of atomic, molecular, and nuclear physics.

    Comments:
    19 pages, 6 figures, 2 Tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.07336 [pdf]
    Reson.(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE